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dhcp/0018-dhcp-4.2.6-improved-xid.patch
Marius Tomaschewski 689173fdb4 - Applied fixes for DHCP over IPoIB by Mellanox (bnc#870535) 
[+ 0017-dhcp-4.2.6-lpf-ip-over-ib-support.patch,
   + 0018-dhcp-4.2.6-improved-xid.patch]

OBS-URL: https://build.opensuse.org/package/show/network:dhcp/dhcp?expand=0&rev=125
2014-03-28 19:03:40 +00:00

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From 3a2059b67c3adfccd65f1e10aebf8ba73d51bcd1 Mon Sep 17 00:00:00 2001
From: root <root@reg-ovm-036-004.lab.mtl.com>
Date: Tue, 25 Mar 2014 23:30:18 +0200
Subject: [PATCH 2/2] dhcp 4.2.6 improved xid
---
client/dhclient.c | 70 ++++++++++++++++++++++++++++++++++++++++++++-----------
1 file changed, 56 insertions(+), 14 deletions(-)
diff --git a/client/dhclient.c b/client/dhclient.c
index f7dfbef..bfa99fb 100644
--- a/client/dhclient.c
+++ b/client/dhclient.c
@@ -619,6 +619,26 @@ main(int argc, char **argv) {
}
}
+ /* We create a backup seed before rediscovering interfaces in order to
+ have a seed built using all of the available interfaces
+ It's interesting if required interfaces doesn't let us defined
+ a really unique seed due to a lack of valid HW addr later
+ (this is the case with DHCP over IB)
+ We only use the last device as using a sum could broke the
+ uniqueness of the seed among multiple nodes
+ */
+ unsigned backup_seed = 0;
+ for (ip = interfaces; ip; ip = ip -> next) {
+ int junk;
+ if ( ip -> hw_address.hlen <= sizeof seed )
+ continue;
+ memcpy (&junk,
+ &ip -> hw_address.hbuf [ip -> hw_address.hlen -
+ sizeof seed], sizeof seed);
+ backup_seed = junk;
+ }
+
+
/* At this point, all the interfaces that the script thinks
are relevant should be running, so now we once again call
discover_interfaces(), and this time ask it to actually set
@@ -633,14 +653,36 @@ main(int argc, char **argv) {
Not much entropy, but we're booting, so we're not likely to
find anything better. */
seed = 0;
+ int seed_flag = 0;
for (ip = interfaces; ip; ip = ip->next) {
int junk;
+ if (ip->hw_address.hlen <= sizeof seed)
+ continue;
memcpy(&junk,
&ip->hw_address.hbuf[ip->hw_address.hlen -
sizeof seed], sizeof seed);
seed += junk;
+ seed_flag = 1;
}
- srandom(seed + cur_time + (unsigned)getpid());
+ if ( seed_flag == 0 ) {
+ if ( backup_seed != 0 ) {
+ seed = backup_seed;
+ log_info ("xid: rand init seed (0x%x) built using all"
+ " available interfaces",seed);
+ }
+ else {
+ seed = cur_time^((unsigned) gethostid()) ;
+ log_info ("xid: warning: no netdev with useable HWADDR found"
+ " for seed's uniqueness enforcement");
+ log_info ("xid: rand init seed (0x%x) built using gethostid",
+ seed);
+ }
+ /* we only use seed and no current time as a broadcast reply */
+ /* will certainly be used by the hwaddrless interface */
+ srandom(seed);
+ }
+ else
+ srandom(seed + cur_time + (unsigned)getpid());
/* Setup specific Infiniband options */
for (ip = interfaces; ip; ip = ip->next) {
@@ -1143,7 +1185,7 @@ void dhcpack (packet)
return;
}
- log_info ("DHCPACK from %s", piaddr (packet -> client_addr));
+ log_info ("DHCPACK from %s (xid=0x%x)", piaddr (packet -> client_addr), client -> xid);
lease = packet_to_lease (packet, client);
if (!lease) {
@@ -1861,7 +1903,7 @@ void dhcpnak (packet)
return;
}
- log_info ("DHCPNAK from %s", piaddr (packet -> client_addr));
+ log_info ("DHCPNAK from %s (xid=0x%x)", piaddr (packet -> client_addr), client -> xid);
if (!client -> active) {
#if defined (DEBUG)
@@ -1988,10 +2030,10 @@ void send_discover (cpp)
client -> packet.secs = htons (65535);
client -> secs = client -> packet.secs;
- log_info ("DHCPDISCOVER on %s to %s port %d interval %ld",
- client -> name ? client -> name : client -> interface -> name,
- inet_ntoa (sockaddr_broadcast.sin_addr),
- ntohs (sockaddr_broadcast.sin_port), (long)(client -> interval));
+ log_info ("DHCPDISCOVER on %s to %s port %d interval %ld (xid=0x%x)",
+ client -> name ? client -> name : client -> interface -> name,
+ inet_ntoa (sockaddr_broadcast.sin_addr),
+ ntohs (sockaddr_broadcast.sin_port), (long)(client -> interval), client -> xid);
/* Send out a packet. */
result = send_packet(client->interface, NULL, &client->packet,
@@ -2260,10 +2302,10 @@ void send_request (cpp)
client -> packet.secs = htons (65535);
}
- log_info ("DHCPREQUEST on %s to %s port %d",
+ log_info ("DHCPREQUEST on %s to %s port %d (xid=0x%x)",
client -> name ? client -> name : client -> interface -> name,
inet_ntoa (destination.sin_addr),
- ntohs (destination.sin_port));
+ ntohs (destination.sin_port), client -> xid);
if (destination.sin_addr.s_addr != INADDR_BROADCAST &&
fallback_interface) {
@@ -2303,10 +2345,10 @@ void send_decline (cpp)
int result;
- log_info ("DHCPDECLINE on %s to %s port %d",
- client->name ? client->name : client->interface->name,
+ log_info ("DHCPDECLINE on %s to %s port %d (xid=0x%x)",
+ client->name ? client->name : client->interface->name,
inet_ntoa(sockaddr_broadcast.sin_addr),
- ntohs(sockaddr_broadcast.sin_port));
+ ntohs (sockaddr_broadcast.sin_port), client -> xid);
/* Send out a packet. */
result = send_packet(client->interface, NULL, &client->packet,
@@ -2349,10 +2391,10 @@ void send_release (cpp)
return;
}
- log_info ("DHCPRELEASE on %s to %s port %d",
+ log_info ("DHCPRELEASE on %s to %s port %d (xid=0x%x)",
client -> name ? client -> name : client -> interface -> name,
inet_ntoa (destination.sin_addr),
- ntohs (destination.sin_port));
+ ntohs (destination.sin_port), client -> xid);
if (fallback_interface) {
result = send_packet(fallback_interface, NULL, &client->packet,
--
1.7.12.4
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